Scientists have demonstrated for the first time that 800,000 brain cells living in a petri dish can perform goal-directed tasks . They played the simple computer game ping pong. The research paper was published in the journal Neuron. To conduct the experiment, the team of scientists collected mouse cells derived from embryonic brains and some human brain cells derived from stem cells. They placed them on an array of microelectrodes, which could both stimulate them and read their activity. Electrodes on the left and right sides of an array are lit to tell the organoids which side of the brain the ball is on, while the distance from the racket is indicated by the frequency of the signal. Feedback from the electrodes tells the dish organoids how to return the ball to the ball by making the cells act like a racket.
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